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Preview: Electronics Infoline

Electronics Infoline

A giant collection of electronics projects and schematics on the web!

Last Build Date: Sun, 22 Jan 2017 05:23:20 +0000


Skill Sunday: Power Over Ethernet for Arduino

Sun, 22 Jan 2017 04:18:00 +0000


Pinned onto Freetronics

One of the challenges of working with an Ethernet connected Arduino device can be having to get both an Ethernet cable and a power cord to the device. Power over Ethernet or PoE solves this problem by running power through the Ethernet cable! To find out more about this useful solution checkout the tutorial we have written to explain the ins and outs of PoE in more detail.


If you are planning on using PoE in one of your own projects you may need our 28V Power Regulator for PoE. This versatile device can be used as a general purpose regulator outputting 5V or 7V from an input voltage of up to 28V, however, the regulator is designed to mount onto our EtherTen or EtherMega Arduino compatible boards and pre regulate the voltage inputted to your device from PoE down to the 7V the Arduino can handle. To find out more and to purchase checkout the following link


Find this week's Skill Sunday useful? Have an idea for a skill we should feature next week? Let us know in the comments section below or on Facebook and Twitter.(image)

More on Color TFT Displays ~ The Big Ones — 240 X 320

Sun, 22 Jan 2017 00:19:00 +0000

Pinned onto N6QWReally Big (bigger) Displays the 240 X 320 Color TFTAbout two years ago I bought several of the 240 X 320 displays and immediately was struck by how much information can be displayed on the face of the unit and  like a choice of 256K colors. Lots of customization can be had here. Unlike the 128 x 128 or 128 X 160, which I used straight into the Arduino pins, these larger displays Do Not Like to see 5 VDC.  They like to see 3.3 VDC and typically a "Level Shifter" must be interjected between the 5 volt Arduino Pins and the pins on the display which like to see 3.3 VDC. So this is where I get emails about running the Arduino at 3.3 VDC and then no level shifting is required. Not sure my heart is that strong to do that. The literature abounds with tricks and tips to do the level shifting. One method involves a series resistor combination of a 4.7K in series with a 10K (the 10K other end is at ground). Now to the high level math. If you ran 5 VDC through the 14.7K resistor( 4.7K + 10K) the current via ohms law would be 5/14.7K = .340 milliamp . Now a bit more math .340 milliamp flowing through 10K would be a voltage drop of 3.4 volt and the drop across the 4.7K would be 1.6 volts. So at the junction of the 4.7 K and 10K you would read 3.4 VDC. Thus one end of the 4.7K is connected to the Arduino pin the junction connection of the 4.7K and 10K is peeled off to the display and the other end of the 10K goes to ground. Instant level shifter. You would need 6 such combinations of 4.7K and 10K resistors. Another way is to take an IC such as a hex buffer IC such as the CD4050 and by connecting 3.3 VDC to Pin 1 (Vdd) all inputs to the IC (six total) are outputted at 3.3 VDC. Many of the wing nut jobs hate this approach because it is not bi-directional. There are bi-directional level shifters but cost more than the nominal 50 cents for the CD4050. In my application I only need a single direction and that is a down shift. Below is the pin out for the CD4050   Here is the display and you will get a sense of the size with the ease of readability. Did I mention about the 256K color choices?   So now the problem is since the CD4050 level shifter will be used --how do you hook up the display? A glib answer would be carefully! Shown below is a hand sketch of the Nano ICSP and a decode of the pins on the back of the display. Note Vcc is connected to 3.3 VDC not 5 VDC as shown on the sketch.  So yes many will have trouble connecting the dots so the magic decoder ring is provided below. Please no inquires about how to connect the output of the Si5351 --CLK0 is the LO and CLK2 is the BFO.  73'sPete N6QW [...]

Vertical Pole Climbing Robot

Sat, 21 Jan 2017 11:39:00 +0000


Pinned onto Freetronics

With this project from Pramod you can build your own climbing robot which is designed to scale street lights or flag poles. The robot can be used either as a cleaning robot or as a surveillance tool once a camera has been attached. This project is a great way to learn about using motors with Arduino. To get started checkout the following link.


When you use motors in your Arduino project you will almost certainly need a H-Bridge motor driver. A H-Bridge allows you to easily control the direction of your motors from within your code. Our own Dual Channel H-Bridge Motor Driver Shield is a perfect solution to this problem, allowing you to drive two DC motors or a stepper motor.


The Dual Channel H-Bridge Motor Driver Shield features PWM control, selectable current limits and a prototyping area to add your own parts. To find out more check out the Dual Channel H-Bridge Motor Driver Shield page.

To keep up to date with the latest news, projects, product announcements  and to let us know what you think of this project follow us on Facebook and Twitter.


ESP8266 Weather Station Projects

Fri, 20 Jan 2017 21:03:21 +0000


Pinned onto Squix Techblog

In this post I’d like to show you some of the projects that other people did based on my WeatherStation library. I hope this will inspire you to get creative and extend the code with you features. Or maybe you have built a nice case around the WeatherStation. If you do so please contact and ...

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Single tube Lethal Nixie clock

Fri, 20 Jan 2017 19:35:20 +0000


Pinned onto Dangerous Prototypes

Andrew Moser made a lethal nixie tube clock: Clock 1: Single tube Lethal Nixie clock — you know having all the high voltage lines exposed and un-insulated. Inspiration for this design was from this clock. Unfortunately I built mine right after having surgery. I think the painkillers had something to do with the aesthetics… Anyhow […](image)

How to make a simple 1 watt audio amplifier (LM386 based)

Fri, 20 Jan 2017 18:54:39 +0000


Pinned onto Dangerous Prototypes

A tutorial on making an LM386 audio amplifier circuit from Afrotechmods: A tutorial on how to use the popular LM386 class AB audio amplifier IC to build a simple mono 1 watt audio amplifier. It costs less than $3 in parts! There is also a brief discussion of how to use high pass filters to […](image)

Flashing Binaries to DRA7xx Factory Boards Using Device Firmware Upgrade

Fri, 20 Jan 2017 18:30:06 +0000


Pinned onto EEWeb

This application report provides detailed procedures for flashing the binary images to eMMC Flash memory using Device Firmware Upgrade (DFU). G...(image)

Dot² isn’t your typical coffee table

Fri, 20 Jan 2017 18:08:47 +0000


Pinned onto Arduino Blog

Coffee tables are useful for putting coffee, food, or perhaps way too much junk on, but it’s 2017—we can do better than that! Akshay Baweja certainly has at least with Dot², an interactive piece of furniture that can run animations, display lighting effects, and play old-school games. The Arduino Mega-based table features a matrix of 296 LEDs that shine up […](image)

Debugging ARM Cortex-M0+ HardFaults

Fri, 20 Jan 2017 01:58:05 +0000


Pinned onto Dangerous Prototypes

Erich Styger has written an article on debugging a hard fault on an ARM Cortex-M0+ device: To me, one of the most frustrating things working with ARM Cortex-M cores are the hard fault exceptions. I have lost several hours this week debugging and tracking an instance of a hard fault on an ARM Cortex-M0+ device. More […](image)

EMP Jammer build

Fri, 20 Jan 2017 00:06:05 +0000


Pinned onto Dangerous Prototypes

A how-to on making an EMP jammer from JunezRiyaz, project instructables here: An electromagnetic pulse (EMP), also sometimes called a transient electromagnetic disturbance, is a short burst of electromagnetic energy. Such a pulse may occur in the form of a radiated electric or magnetic field or conducted electrical current depending on the source. EMP Jammer is a device […](image)

A 3D-printed e-drum pad

Thu, 19 Jan 2017 19:09:05 +0000


Pinned onto Arduino Blog

After making his first drum with a laser cutter, Ryo Kosaka redesigned it as a 3D-printed structure so more people could build it. If you’d like to practice playing the drums, but would rather not disturb your family, roommate, neighbors, dog, etc., then an electronic version is probably a good idea. Since you’re reading our […](image)

Interactive geodesic LED dome = extreme geometric fun!

Thu, 19 Jan 2017 15:22:10 +0000


Pinned onto Arduino Blog

We’ve all seen geodesic domes in one form or another, whether as a modern experiment, as housing from a bygone era, or perhaps as a gigantic structure in Orlando (technically a geodesic sphere). Jon Bumstead apparently wasn’t satisfied with current dome options, and instead created his own, integrating elements from programmable LED tables to make it […](image)

Guide to build your 3.3v power supply

Thu, 19 Jan 2017 04:54:21 +0000


Pinned onto Gadgetronicx

  The industry of Electronics is going through a paradigm shift as there is an increase in demand of devices which consume less power. It also had a significant effect on hobbyists, tinkerers and engineers as market for 3.3v components...
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The post Guide to build your 3.3v power supply appeared first on Gadgetronicx.


SDR radio breathes life into a 75 year old Marconi CR100

Thu, 19 Jan 2017 02:02:51 +0000


Pinned onto Dangerous Prototypes

  Jon Hudson over at DesignSpark‎ writes: This is a belated post of a fun project we did for RS Components. With the upcoming 80th anniversary of the founding of ‘RadioSpares’ – the original name for UK-based RS-Components, and the creation of an “Engineers’ Playground” as a feature of the 2016 Electronica event in Munich, […](image)

A Time for Ranting!

Thu, 19 Jan 2017 01:39:00 +0000


Pinned onto N6QW

Things that are obvious are obvious!!!!!I receive many emails regarding some of my projects. Sitting on this end I wonder a bit about those who sends the emails. Mind you I am not saying I am infallible or not subject to error; but there is a differenc...(image)

Emulate a Commodore 64 keyboard with a modern PC and an Arduino

Wed, 18 Jan 2017 21:09:51 +0000


Pinned onto Arduino Blog

Using an Arduino, Adam Podstawczynski is able to translate keystrokes on his notebook to character inputs on a C64. If you enjoy using a Commodore 64, but either don’t like (or perhaps don’t have) its keyboard, Podstawczynski’s project could be a great solution. His build runs a Python script on a PC, Mac, or Linux computer, which […](image)

USB2005 and USB97C202 Sharing ATA/ATAPI Drive w/ Another Controller

Wed, 18 Jan 2017 21:00:53 +0000


Pinned onto EEWeb

This application note describes how to implement a design where a single ATA/ATAPI device is shared by the SMSC USB2005 USB ATA/ATAPI controlle...(image)

Robotic Cat Laser

Wed, 18 Jan 2017 13:36:00 +0000

Pinned onto FreetronicsDoes your pet cat love chasing around a laser light? For the cost of a couple of servo motors, an Arduino and a laser light you can provide your cat with endless entertainment.  The automated cat laser uses servo motors to constantly move the laser and entertain the cat, with no effort on your behalf! To find out how you can build your own cat laser robot checkout the instructable from joe at the following link.  If you are looking for a servo motor to use in your own robotics project why not checkout our standard servo. The standard hobby servo rotates approximately 180 degrees and comes with a variety of horns, mounting screws and rubber mounting bushes. To find out more check out the product page. Found this project interesting? Working on own of your own projects you would like us to feature? Let us know in the comments section below or on Facebook and Twitter.   [...]

LED traffic light

Wed, 18 Jan 2017 13:02:20 +0000


Pinned onto Dangerous Prototypes

Domen Ipavec shared his DIY LED traffic light in the project log forum: Traffic lights are all around us, and they seem simple enough but are they really? Real traffic lights can be a very complicated system because it requires sophisticated control and coordination for smooth and safe traffic. The traffic light I made is […](image)

Estimating Power for ADSP-BF561 Blackfin® Processors

Mon, 16 Jan 2017 20:00:03 +0000


Pinned onto EEWeb

This EE-Note discusses the methodology for estimating total average power consumption of ADSPBF561 Blackfin® embedded symmetric multiproces...(image)

Teach Your Arduino to Switch Itself Off!

Mon, 16 Jan 2017 19:56:00 +0000

Pinned onto FreetronicsHave you ever been frustrated that the only way you could turn off your Arduino was to physically unplug the device? With this instructable from PeterH310 you can learn how to "self power off" your Arduino. Although some projects require an Arduino to be always on, for projects that don’t require the Arduino to be consistently on, this trick can be a great for added convenience and power saving. To find out more check out the following link. If you are looking for a very straight forward way to get started with Arduino our Thinker Shield is a great option.  The shield is ideal for beginners and includes a number of buttons, a buzzer, LEDs and more so that you can get started making all sorts of cool projects! Not only this, but you can find a fantastic project guide on our website! Checkout the product page to find out more. Inspired by this project? Working on a cool project of your own? Let us know in the comments section below or on Facebook and Twitter.   [...]

Control a tracked robot with your mind (or joystick)

Mon, 16 Jan 2017 19:29:49 +0000


Pinned onto Arduino Blog

Whether you choose to control this vehicle with your mind or a joystick, the camera mounted on it will give you a new view of the world. Maker “Imetomi” was inspired to create a tracked robot after he was able to salvage a camera off of a cheap drone. This became the basis of his FPV […](image)

A 400W (1kW Peak) 100A electronic load using linear MOSFETs

Mon, 16 Jan 2017 16:59:56 +0000


Pinned onto Dangerous Prototypes

Kerry Wong built a 400W/100A electronic load using linear MOSFETs:  I bought a couple of IXYS linear MOSFETs (IXTK90N25L2) a while ago to test their capabilities when used as electronic load, and the result was quite impressive. So I decided to build another electronic load using both MOSFETs. As you can see in the video towards […](image)

Shirt Pocket Transceiver with the Si5351 and OLED

Mon, 16 Jan 2017 16:07:23 +0000


Pinned onto Dangerous Prototypes

Pete Juliano’s (N6QW) Shirt Pocket Transceiver with the Si5351 and OLED display: In 2011 I fulfilled a dream of building a shirt pocket sized QRP SSB transceiver. Well actually I built two of them and the second was a diminutive 2″ X 4″ X 2″. Both used through hole components –so no cheating with SMD. […](image)

Top 10 ways to increase your practical engineering knowledge as an Electronics Engineer

Mon, 16 Jan 2017 07:12:14 +0000


Pinned onto Articles

The world of science and technology is changing exponentially and this is the main reason why an engineer should keep enhancing his skills and learn new ones so that he can keep up with this ever changing technology. Electronic engineering is also not speared form this rapid evolution. Moore’s Law (1965) for example has been […](image)

All metal C930e webcam

Mon, 16 Jan 2017 04:11:41 +0000


Pinned onto KoruKesu

(image) I had Logitech C930e webcam laying in my drawer for a while waiting for a better fate. So today finally fitted it into aluminium C920 enclosure to be used with CS lenses. Actually it did not took much, had to remove some material on my trusty Proxxon MF 70 mini mill, everything else fitted like […](image)

The Soldering Tools That Make Your Life Easier

Mon, 16 Jan 2017 00:00:00 +0000


Pinned onto Build Electronic Circuits

The soldering tools you need and how to choose a soldering iron

Copyright Build Electronic Circuits


App note: Operation evaluation of ultra low ON resistance MOSFET supporting quick charge for 1 cell Lithium ion battery protection

Sun, 15 Jan 2017 17:00:41 +0000


Pinned onto Dangerous Prototypes

ON semiconductor’s application note on faster charging of Lithium Ion batteries with consideration on heat suppression. Link here (PDF) Currently, because LiB (Lithium Ion Battery) is superior in current density and electromotive force, it becomes mainstream of batteries for mobiles such as smart phone. However, because LiB is weak at over-charge and over-discharge, a control […](image)

Synthesized Sidetone

Sun, 15 Jan 2017 13:42:00 +0000


Pinned onto Shack Nasties

The m0xpd bench is full of even more tangles of wire, associated with analog synthesis.I realised this morning that my new system could be gated by any time sequence, such as that produced by my Morse keyer - it is Funky after all! So, I've made the mo...(image)

App note: Application precautions: Power MOSFET application notes

Sun, 15 Jan 2017 13:00:32 +0000


Pinned onto Dangerous Prototypes

Toshiba’s application note on the things to consider when picking a power MOSFET. Link here (PDF) This document explains selecting MOSFETs and what we have to consider for designing MOSFET circuit, such as temperature characteristics, effects of wire inductance, parasitic oscillations, avalanche ruggedness, and snubber circuit.(image)

A high current power supply built around a server voltage regulator

Sat, 14 Jan 2017 22:00:05 +0000


Pinned onto Andys Workshop


Regular readers of this blog will have already seen the article that I published about 4 months ago where I attempted to reverse engineer a voltage regulator module originally designed to fit into a Dell server. The theory was that these would be high quality, stable and robust designs that could prove useful if I […](image)

Bridge Monitoring System using Wireless Sensor Network

Sat, 14 Jan 2017 17:54:55 +0000


Pinned onto Zx Lee

It’s been a long time since I last work on any hobby project and update on my blog. Recently, I completed a mini project together with two of my friends. So I am going to take this opportunity to share... Continue Reading →(image) (image)

Media Files:

Piezoelectric Micropump Driver

Sat, 14 Jan 2017 14:00:28 +0000


Pinned onto EEWeb

In medical devices for precision controlled drug delivery, such as infusion pumps, insulin pumps or nebulizers, piezoelectric micropumps offer an attractive alt...(image)

Fixed DC/DC Regulator Output Margining Using Digitally Controlled Potentiometer

Fri, 13 Jan 2017 18:30:05 +0000


Pinned onto EEWeb

Many applications using a DC/DC regulator are implemented with a resistor divider in the feedback path to set up Vout. However, for some high end applications, the voltage needs to be adjusted in order to optimize the application’s performance. A Digitally Controlled Potentiometer (DCP) can be used in both high end and low end applications […](image)

An Arduino-powered automatic guitar footswitch

Fri, 13 Jan 2017 15:31:16 +0000


Pinned onto Arduino Blog

If remembering to hit your foot pedal at the right time during shows is a challenge, this device will take care of it for you. As creator Franco Molina points out, there’s a lot to worry about when playing guitar in front of an audience. Actually playing is one thing, but you have to pay […](image)

A Mass Programming Bench for ATMega32u4 MCUs

Fri, 13 Jan 2017 14:54:00 +0000


Pinned onto My Projects

Or how to try to spend as little time as possible programming several thousands MCUs…. Why…. Just Why? As you may know I started the Mooltipass offline password keeper project more than 2 years ago. Together with a team of volunteers from all over the globe I created two Mooltipass devices which were successfully crowdfunded […](image)

Shirt Pocket Transceiver withe the Si5351 and OLED

Fri, 13 Jan 2017 02:17:00 +0000


Pinned onto N6QW

Moving on with the latest Technology! In 2011 I fulfilled a dream of building a shirt pocket sized QRP SSB transceiver. Well actually I built two of them and the second was a diminutive 2″ X 4″ X 2″. Both used through hole components –so no cheating with SMD. In each case the IF was 4.0152 […](image)

Building an AT2XTKB (AT to XT) keyboard adapter on prototype board

Thu, 12 Jan 2017 22:09:25 +0000


Pinned onto Dangerous Prototypes

Matt built an AT2XT keyboard adapter on prototype board using an AT to PS/2 keyboard cable. Project info at Matt’s Tech Pages. Matt built an AT2XT keyboard adapter on prototype board using an AT to PS/2 keyboard cable. Project info at Matt’s Tech Pages. Read more Here(image)

These students created their own Overwatch VR rig

Thu, 12 Jan 2017 21:51:47 +0000


Pinned onto Arduino Blog

A group of high school students in South Korea have created a multi-part rig that lets them play Overwatch in virtual reality. Their console, which resembles somewhat of a Virtuix Omni treadmill, enables users to move around the battlefield by leaning in whichever direction they want to go, to fire and reload their weapon with a custom toy gun controller, and even to hit things by […](image)

Sony TC-252 reel to reel player restoration

Thu, 12 Jan 2017 14:11:58 +0000


Pinned onto Dangerous Prototypes

Dilshan Jayakody has written an article about Sony TC-252 reel to reel player repair: As a first step of the restoration we remove the LA4440 module attached into that recorder and rewire the player with original wiring layouts. After rewiring we check all the transistors in that player and find-out that the couple of 2SC634 […](image)

Low Power Techniques for Atmel SMART ARM MCUs

Wed, 11 Jan 2017 21:00:29 +0000


Pinned onto EEWeb

This application note explains about low power modes available in Atmel® | SMART SAM3/SAM4 Microcontroller family. This application note also gives a walkthrough on information, techniques, and strategies, which can help in achieving low power with Atmel SMART ARM®-based MCUs. In low power targeted applications, many factors have to be considered to bring down the […](image)

Attachment is like a modern-day message in a bottle

Wed, 11 Jan 2017 20:11:08 +0000


Pinned onto Arduino Blog

If you want to reach out to someone, you could always pick up your phone and send a text. But if you’re seeking something a bit more random and indirect, one idea would be to write and attach a message to a biodegradable balloon using Swiss designer David Colombini’s “poetic machine.” Colombini’s Attachment project allows you to […](image)

Arduino Eye Tracking

Wed, 11 Jan 2017 19:55:00 +0000


Pinned onto Freetronics

With this awesome project from thesystemis you can draw using only the movement of your eyes! Surprisingly this project can be made quite cheaply using the brainpower of an Arduino Uno which talks to the open source eye tracking software – “EyeWriter” running on a computer.  If you want to find out more check out […](image)

Scare away unwanted guests with an eye-moving portrait

Wed, 11 Jan 2017 17:07:20 +0000


Pinned onto Arduino Blog

There are certainly many ways to generate an old-looking portrait with moving eyes, but this method from Sonic Robots is simple and seems quite effective. The basic formula is to buy a Victorian-like frame, get a picture of a loved/hated/random person (preferably tweaked to resemble an antique oil painting), then put a strip of paper with eyes printed on […](image)

Inside the 74181 ALU chip: die photos and reverse engineering

Wed, 11 Jan 2017 15:17:14 +0000


Pinned onto Dangerous Prototypes

A detailed die photos and reverse engineering of the 74181 ALU chip by Ken Shirriff: What’s inside a TTL chip? To find out, I opened up a 74181 ALU chip, took high-resolution die photos, and reverse-engineered the chip.1 Inside I found several types of gates, implemented with interesting circuitry and unusual transistors. The 74181 was a […](image)

Watch an Arduino Mega-based robot play the bagpipes

Tue, 10 Jan 2017 19:22:39 +0000


Pinned onto Arduino Blog

Using gigantic hands scaled up from a prosthetic design, “XenonJohn” can now hear the sweet sounds of Scotland whenever he wants. Seeing this invention, you might note to yourself that most instrument-playing robots don’t actually bother to have realistic—if huge, at 171% normal print size—hands attached. Then again, you probably haven’t seen a robot configured […](image)

It takes two Raspberries to run a clock

Tue, 10 Jan 2017 15:01:42 +0000


Pinned onto KoruKesu

Despite lousy title, I will tell my success story how to add visual output to well known IoT tool called Node-RED. One Raspberry Pi, let’s call it RPI-RED, will be running Node-RED another one RPI-LED will be dedicated to server LED panel. First you should should install Node-RED to RPI-RED. Installation is well described in […](image)

Cozy Coupe toy car retrofitted with Arduino

Tue, 10 Jan 2017 14:27:06 +0000


Pinned onto Arduino Blog

Using an Arduino Uno along with an Adafruit Wave Shield, Brent Chapman added more features to the Little Tikes Cozy Coupe including a push-to-start ignition and a sound system. Although Chapman notes that the Coupe comes with some onboard entertainment options, he thought “his client” deserved something a bit more high-tech. This meant that he retrofitted the classic toy […](image)

Tear down of a super capacitor

Tue, 10 Jan 2017 13:05:39 +0000


Pinned onto Dangerous Prototypes

  A teardown video of a 1 Farad super capacitor from Electronupdate: In a recent video on the tear down of an electrolytic cap a viewer was wondering what a super capacitor looks like. They have much more capacitance: 10,000 time more on average for the same volume. Surely this means the physical construction must be amazing! […](image)

EasyESP-1: a rapid prototyping and development board for ESP8266

Tue, 10 Jan 2017 02:09:33 +0000


Pinned onto Dangerous Prototypes

Raj over at Embedded Lab has designed a development board for ESP8266: EasyESP-1 is a rapid prototyping board for the low-cost, WiFi-enabled ESP8266 microcontroller. With an onboard USB-to-Serial converter pre-installed, EasyESP-1 does not require any additional hardware to download your application firmware to the ESP8266 chip. The ESP module used in this development board is […](image)

Back to Bitx40 and OLED Displays

Mon, 09 Jan 2017 23:53:00 +0000


Pinned onto N6QW

Expanding the Bitx40 Horizon … More Hacks! In the course of adding a few refinements to my Bitx40 OLED display, I now have found  new dimensions to displaying information and some additional possibilities for the rig. In the realm of “cool factor” I now have managed to juggle information locations so I can include my […](image)

SmartPID is a smart temperature and process controller

Mon, 09 Jan 2017 23:11:50 +0000


Pinned onto Arduino Blog

Professionally engineered, SmartPID is a high-tech, programmable temperature and process controller for the DIY community. Compared to a basic on/off thermostat, SmartPID is an “open platform” that can collect temperature from multiple sensors, apply programmable control logic, and drive different loads with a precise PID algorithm. Not only can SmartPID control any thermos-regulated process, heating or cooling, it can be used for […](image)

Arduino Fridge Thermostat

Mon, 09 Jan 2017 20:20:00 +0000


Pinned onto Freetronics

Often the thermostat on a fridge can break rendering the entire fridge useless without costly repair. Fortunately, like most problems, this can be solved using Arduino! Asynkronix has put together a great guide on how you can use an Arduino to cheaply replace a broken thermostat in your fridge. The fix works by reading the […](image)

Redundant Fan Systems Using the TC647 Fan Manager

Mon, 09 Jan 2017 20:00:01 +0000


Pinned onto EEWeb

Certain applications, such as file servers, require redundant cooling fans to ensure uninterrupted system service, even with cooling fan malfunctions present. Typically, such systems have a primary fan to cool the system and one or more “standby” fans that are automatically placed into service should the primary fan fail. Multiple TC647s can be used to implement […](image)

Curtis 1231C-8601 500A PWM DC motor controller teardown

Mon, 09 Jan 2017 13:43:41 +0000


Pinned onto Dangerous Prototypes

Jay did a teardown of a Curtis 1231C-8601 500A PWM DC motor controller: The Curtis 1231c-8601 power board is relatively simple. It uses 18 MOSFETS in parallel to switch current from the motor- terminal back to the battery- terminal (the motor+ lead is already connected to battery+). The MOSFETs it uses are IXYS IXTH50N20 SP9536 chips. […](image)

Node-RED for rapid hardware wiring

Mon, 09 Jan 2017 04:03:58 +0000


Pinned onto KoruKesu

I will be posting few interesting follow-up posts that are based on tool for wiring together hardware devices called Node-RED. This post will serve as a reference how to prepare Raspberry Pi and install it. Besides usual IoT stuff (sensor serving, data collection, aggregation and decision making) I see great opportunity to use node-red in rapid […](image)

A Diversion from all the Bitx40 Stuff!

Sun, 08 Jan 2017 18:32:00 +0000


Pinned onto N6QW

Does anyone in Radio Land know what this is?      OK do you give up? Well guys and gals this is the world’s most important tool vintage 1965 if you were in a forward combat area and wanted to eat. Yes this foldable, carry on your key chain, (along with your dog tags) is […](image)

App note: Redefining a new state-of-the-art in microampere current-sense amplifiers

Sun, 08 Jan 2017 17:00:34 +0000


Pinned onto Dangerous Prototypes

Silicon Lab’s TS1100 and TS1101 current sense amplifier’s features discussed in this app note. Link here (PDF) Sensing and controlling supply current flow are a fundamental requirement in most all electronic systems from battery-operated, portable equipment to mobile or fixed-platform power management and dc motor control. High-side current-sense amplifiers (or “CSAs”) are useful in these […](image)

Analog Synths

Sun, 08 Jan 2017 15:40:00 +0000


Pinned onto Shack Nasties

Cameron was talking about analog synthesizers last week and he got me interested. I refer, of course to my colleague Cameron and not to the former ‘Prime’ Minister. Don’t expect any political comment or porcine quips – that really would be beneath me… There’s quite a lot of common ground between me and analog synths: […](image)

App note: Multiple Capture/Compare/PWM (MCCP): Extending the functionality for low-cost motor control applications

Sun, 08 Jan 2017 13:00:33 +0000


Pinned onto Dangerous Prototypes

Microchip’s MCCP module on PIC32 devices demonstrate the built-in majority detection filter for simpler motor control drives. Link here (PDF) The motor control industry has been focusing on designing low-cost motor control drives for various applications. The consumer demand for low-cost motor control applications is driving this trend. Microchip has recently introduced the PIC32MM family […](image)

Compact Synchronous Buck Converter

Sat, 07 Jan 2017 14:00:52 +0000


Pinned onto EEWeb

The ISL800xxxDEMO1Z boards are intended for use by individuals with requirements for point-of-load applications sourcing from 2.7V to 5.5V. The ISL800xxxDEMO1Z boards are used to demonstrate the performance of the ISL80020, ISL80020A, ISL80015, ISL80015A low quiescent current mode converter. The ISL800xxxDEMO1Z boards are intended for use by individuals with requirements for point-of-load applications sourcing from […](image)

Qume 842 8″ floppy drive with a RC2014 Z80 retrocomputer

Sat, 07 Jan 2017 09:01:42 +0000


Pinned onto Dangerous Prototypes

  Dr. Scott Baker writes, “In this video, I try out some Qume 8 inch floppy drives that I bought on eBay. I interface them to a WD37C65 controller on my Z80 CP/M computer and I format the disks and read/write some files to them.”     Dr. Scott Baker writes, “In this video, I try out […](image)

Arduino car alarm honks for help!

Fri, 06 Jan 2017 18:40:54 +0000


Pinned onto Arduino Blog

Sure, if you’re going to get a new ride, a model from the twenty-teens would be nice, but for hacking purposes, the simplicity of an older cars makes modification fairly simple. It also makes hot-wiring easy, and as they don’t generally have an alarm system, these vehicles are often targets for theft. After his friend’s VW Beetle was […](image)

Class D Audio Amplifier Using PIC24FV16KM202

Fri, 06 Jan 2017 18:30:11 +0000


Pinned onto EEWeb

Class D amplifiers have become a popular audio amplifier topology due to their high efficiency and subsequent low cost. The high current output stage is implemented using binary switches, resulting in minimal heat generation and power loss. This allows for the power supply, heat sink and overall physical size of the amplifier to be minimized. […](image)

Die photos and reverse engineering the 74181: The ALU chip in minicomputers

Fri, 06 Jan 2017 17:13:00 +0000


Pinned onto Ken Shirrif

What’s inside a TTL chip? To find out, I opened up a 74181 ALU chip, took high-resolution die photos, and reverse-engineered the chip.1 Inside I found several types of gates, implemented with interesting circuitry and unusual transistors. The 74181 was a popular chip in the 1970s used to perform calculations in the arithmetic-logic unit (ALU) […](image)

LiPo batteries hacking and refurbishing

Fri, 06 Jan 2017 17:07:43 +0000


Pinned onto Dangerous Prototypes

Karman wrote an article showing how to refurbish dead batteries to extend its life: One of the difficult parts when prototyping is to find reliable power sources. Today is still hard to find the battery size we want to use because country exporting frontiers stops these chemical packages. Here I’ll show how to refurbish dead batteries […](image)

More Hacking of the Bitx40

Fri, 06 Jan 2017 16:32:00 +0000


Pinned onto N6QW

Yet another hack of the Bitx40! Think small and smaller! When I built my Bitx40, the display add on  kit which I think now is the standard was not available. So in true ham fashion I simply “rolled my own”. I thought I really got things small when I used an 8X2 backlit LCD coupled […](image)

Polytone Amplifier Page

Fri, 06 Jan 2017 04:33:00 +0000


Pinned onto QRPHB

This is a reprise of the Polytone Amplifier Page from my old QRP HomeBuilder web site (2008). Above — The Mega-Brute has an eight inch speaker and is über-portable. This amp tucks into almost any corner. On the rare occasion when I play for a function, I may use a 12 inch extension speaker, depending […](image)

Turn an Atari 2600 into an electronic drink racer and timer

Thu, 05 Jan 2017 23:12:11 +0000

Pinned onto Arduino BlogThe next time you and your friends want to see who can chug beer (or a non-alcoholic beverage for the younger crowd) the fastest, you may want to try building your own Cider Racer 2600–an electronic racing platform and timer for competitive drinking. Created by YouTuber “MonkeyBOX Entertainment” for an annual Christmas party, the project consists of a broken […] [...]

Wireless Animatronics Hand

Thu, 05 Jan 2017 20:20:00 +0000

Pinned onto FreetronicsWho has not wanted build a robotic hand at some point in their life? Well this is exactly what instructables member njkl44 has done! Not only does this animatronics hand look totally awesome, it actually emulates the movements of the hand that is inside the “control glove”, making a spectacular effect. The control glove uses […] [...]

This guitar-playing robot performs American folk music

Thu, 05 Jan 2017 19:08:00 +0000

Pinned onto Arduino BlogInspired by a statement written on Woody Guthrie’s guitar, This Machine Kills Fascists (TMKF) is an Arduino Mega-based, guitar-playing robot that performs traditional American folk music on a portable stage. Sheet music with the song lyrics are printed and left on the benches set up in front of the stage, while audience members are encouraged […] [...]

Play digital music on this analog interface

Wed, 04 Jan 2017 22:37:10 +0000

Pinned onto Arduino Blog“I’m a big fan of digital music, especially Spotify. The ability to dial-up a much loved song I’ve not heard for ages or discover new music are just some of the benefits I never tire of,” writes UK-based designer Brendan Dawes. “Yet the lack of physicality to this digital medium has always left me wanting. I […] [...]

Effectively Using the Intersil Small Form Factor Power Management Evaluation Boards

Wed, 04 Jan 2017 21:00:54 +0000

Pinned onto EEWebToday's telecom, datacom and computing environments are delivering more power than ever and requiring less space for the DC/DC conversion. Intersil has numerous power management reference designs for POL conversion in the smallest space available. Designers can take the schematic, BOM (Bill of Materials) layout information and apply it directly to their present design, saving […] [...]

Build an FM radio with an Arduino and other spare parts

Wed, 04 Jan 2017 20:54:18 +0000

Pinned onto Arduino BlogAfter not having an FM radio to listen to NPR, electrical engineer Kevin Darrah decided to build his own from spare parts. Like many electronics hackers, Darrah tends to buy random components off of eBay. After all, you may need them at some point, and while cheap, sometimes they take a very long time to […] [...]

DIY Arduino GRBL CNC with a laser

Wed, 04 Jan 2017 16:07:42 +0000

Pinned onto Dangerous Prototypes  A DIY Arduino GRBL CNC with a laser from Bob Davis. Project info at Bob Davis’ blog.   A DIY Arduino GRBL CNC with a laser from Bob Davis. Project info at Bob Davis’ blog. Read more Here [...]

EAGLE: Panelizing made easy

Wed, 04 Jan 2017 11:36:09 +0000

Pinned onto Dangerous PrototypesSjaak shared a tip for panelizing PCB boards in Eagle: Panelizing is done by machining a slot between two or more boards, but keep them attached by a small amount of PCB material (mousebites). I used to do it by hand: generated all the schematics into multiple sheets and then route the board and finally […] [...]

Make your own 3D-printed sonic tractor beam with Arduino

Tue, 03 Jan 2017 19:56:34 +0000

Pinned onto Arduino BlogFrom magic to science, man has long dreamed about being able to manipulate objects from a distance. People have been able to push something using air or even sound waves for a while, but University of Bristol researcher Asier Marzo and colleagues have come up with a 3D-printable device that can not only repel small […] [...]

Measure a magnet’s strength with this DIY Gauss Meter

Tue, 03 Jan 2017 16:11:52 +0000

Pinned onto Arduino BlogYou may know that a neodymium magnet is more powerful than something you usually find on a refrigerator, but by how much? Most people, even those willing to harvest magnets from disk drives, accept that some magnets are stronger than others. This, however, wasn’t quite good enough for Anthony Garofalo, who instead converted a prototype […] [...]

ESP8266 PlaneSpotter Color

Tue, 03 Jan 2017 15:55:44 +0000

Pinned onto Squix TechblogAfter many hours of work I’m very happy to finally publish all the sources for the ESP8266 PlaneSpotter project. It is not yet really in a V1.0.0 state but I’m sure with the help of the community it will quickly get better. While this post is more a “making-of” you can find build instructions on Github: […] [...]

Minstrel ZX80 clone

Tue, 03 Jan 2017 15:28:58 +0000

Pinned onto Dangerous PrototypesDave Curran has a nice build log on his ZX80 clone, which he call Minstrel: Here is a new ZX80 clone that I have called the Minstrel. It is a fairly accurate clone electrically to the ZX80, using the same chips and the original schematic with only a few concessions to the modern world. All the parts are the […] [...]

Z80 Retrocomputing 15 – CP/M on RC2014 Revisted, Using RomWBW

Tue, 03 Jan 2017 06:26:09 +0000

Pinned onto Dr. Scott BlogIn this video, I build a new Flash ROM / RAM board and use it to install the RomWBW CP/M distribution on the RC2014: I’ve already done one video on CP/M on the RC2014, but when I built the Zeta 2 Single Board Computer, I liked Sergey Kiselev’s design so much that I thought I’d […] [...]

Qume 842 8″ floppy drive with a RC2014 Z80 retrocomputer

Tue, 03 Jan 2017 05:17:40 +0000

Pinned onto Dr. Scott BlogIn this video, I try out a pair of Qume 8″ floppy disk drives with the RC2014: Most people who have read my retrocomputing series probably have some familiarity with 3 1/2″ drives or with 5 1/4″ drives. The 8″ drive preceded the 5 1/4″. I never had the experience, having entered the computer scene […] [...]

Telefunken HiFi Studio 1 restoration

Tue, 03 Jan 2017 03:27:00 +0000

Pinned onto Dilshan R JayakodyHiFi Studio 1 is portable boombox manufactured by Telefunken in around 1979. This player consist with 4 band radio (with LW, MW, SW and FM), cassette player / recorder and with 2 × 30W audio power amplifier. Restored HiFi Studio 1 This unit is designed using both ICs and transistors. Receiver of this unit is […] [...]

A simple push-pull audio amplifier using russian rod tubes and power transformers

Tue, 03 Jan 2017 03:09:56 +0000

Pinned onto Dangerous PrototypesKA7OEI blogged about a simple push-pull audio amplifier using russian rod tubes and power transformers: Many years ago I’d read about the type of tube that is now often referred to as a “Gammatron” – a “gridless” amplifier tube of the 1920s, so-designed to get around patents that included what would seem to be fundamental aspects […] [...]

This 3D-printed bionic hand can replace or support a limb

Mon, 02 Jan 2017 21:21:22 +0000

Pinned onto Arduino Blog3D-printed appendages are, as one might suspect, generally meant for those that are missing a limb. Moreover, there are many other people that might retain partial functionality of a hand, but could still use assistance. Youbionic’s beautifully 3D-printed, myoelectric prosthesis is envisioned for either application, capable of being controlled by muscle contraction as if it were a real body part. […] [...]

Using the ISL6430 in DC-DC Converters for Microprocessors in Gateway Applications

Mon, 02 Jan 2017 20:00:37 +0000

Pinned onto EEWebToday’s high-performance microprocessors present many challenges to their power source. High power consumption, low bus voltages, and fast load changes are the principal characteristics which have led to the need for a switch-mode DC-DC converter local to the microprocessor. A common requirement of these and similar processors are decreasing supply voltages as the processor clock […] [...]

Bett 2017: Call for volunteers in London!

Mon, 02 Jan 2017 19:17:14 +0000

Pinned onto Arduino BlogArduino Education empowers educators with the necessary hardware and software tools to create more hands-on, innovative learning experience. Later this month, we’ll be exhibiting our latest STEAM program for upper secondary education at Bett 2017 in London: CTC 101 – Creative Technology in the Classroom 101. We’re looking for volunteers to join our team during […] [...]

RooBee One is an open-source SLA/DLP 3D printer

Mon, 02 Jan 2017 16:00:56 +0000

Pinned onto Arduino BlogAldric Negrier, a Portuguese Maker and owner of RepRap Algarve, has created an SLA 3D printer named RooBee One. Most desktop 3D printers that you’ll see in Makerspaces or advertised for home use drop material onto a bed using a hot extrusion head. The open-source RooBee One, however, employs a DLP projector along with an Arduino Mega to light up each layer […] [...]

Solar battery charge controller teardown

Mon, 02 Jan 2017 14:43:02 +0000

Pinned onto Dangerous Prototypes  A teardown video of a solar battery charge controller from Electronupdate: A solar battery charger: one side goes to a Solar Panel, the other to a lead-acid battery. A charge controller allows the battery to be safely charged. Snagged off of Amazon. Seemed really cheap at $17.36. A look at the assembly quality tells […] [...]

Sony TC-252 reel to reel player restoration

Mon, 02 Jan 2017 03:39:00 +0000

Pinned onto Dilshan R JayakodyTC-252 is 3 speed reel to reel player manufactured by Sony in around 1970 – 1972. This is transistor based tape player with 4W × 2 audio output power, sound-on-sound and sound-with-sound recording features. The TC-252 which we got to restore had many problems. Major problem is someone alter the circuit in that recorder and […] [...]

Fender Telecaster Jazz Box

Sun, 01 Jan 2017 23:19:00 +0000

Pinned onto QRPHBLeo Fender invented the solid body electric guitar. Eventually, his invention became the legendary Fender Telecaster®. This basic guitar: withstood the test of time; exudes versatility; sounds great; and most importantly — proves fun to play. I tried out a number of Fender Telecasters at local music stores and 1 stood out. A blue American […] [...]

App note: Add a “Black Box” fault logger to your “Big (or Small) Box” system

Sun, 01 Jan 2017 17:00:48 +0000

Pinned onto Dangerous PrototypesApplication notes from Maxim Integrated on adding log functionalities in your system. Link here (PDF) This article describes how to add a “black box” functionality – nonvolatile fault logging – to networking, communications, industrial, and medical equipment. It outlines the benefits of recording fault data, including faster, more definitive failure analysis. Application notes from Maxim […] [...]

App note: Selecting current sensors and transformers

Sun, 01 Jan 2017 13:00:41 +0000

Pinned onto Dangerous PrototypesSelection guidelines from Coilcraft. Link here (PDF) Current sensors detect the flow of AC or DC current in a wire or circuit trace. They can be used to detect an on/off/ pulse current condition or to measure the magnitude of the current in the wire or trace. This discussion is limited to AC current sensors. […] [...]

App note: Bluetooth low energy digital pedometer demo design

Sat, 31 Dec 2016 17:00:54 +0000

Pinned onto Dangerous PrototypesAn application note (PDF!) from Microchip: A Bluetooth low energy digital pedometer demo design A digital pedometer is a portable electronic device that counts each step a person takes by detecting the motion of the person’s body with an accelerometer. This application note demonstrates the implementation of a Bluetooth Low Energy Digital Pedometer using the Microchip PIC16LF1718, […] [...]

Next Generation IoT and Wearable Development Platform

Sat, 31 Dec 2016 14:00:27 +0000

Pinned onto EEWebWaRP7 shortens time-to-market by enabling you with the solution which is complete, comes is a tiny form factor, connected and yet flexible enough to offer all the advantages of traditional development tools. The platform consists of a main board and a daughter card. The main board is based on the NXP® i.MX 7Solo applications processor […] [...]

A high-resolution sensor node

Sat, 31 Dec 2016 00:53:37 +0000

Pinned onto Dangerous PrototypesA high-resolution sensor node from JeeLabs: The JeeNode Zero is intended as sensor node in a Wireless Sensor Network. This requires: a sensor we can read out periodically, such as the BME280 being able to sleep with a very low current, as recently described the ability to run the node unattended, i.e. without FTDI cable […] [...]

AFE Calibration on SAM V/E/S7x Microcontrollers

Fri, 30 Dec 2016 18:30:12 +0000

Pinned onto EEWebThe Atmel® | SMART SAM V/E/S7x series are high-performance, power-efficient embedded MCUs based on the ARM® Cortex®-M7 processor. Analog-to-digital converters translate analog measurements, characteristic of most phenomena in the real world, to digital format, used in information processing, computing, data transmission, and control systems. The purpose of this application note is to propose a method […] [...]

Bitx40 Project ~ So you want to build a Bitx40?

Fri, 30 Dec 2016 17:51:00 +0000

Pinned onto N6QWBuilding the Bitx40 ~ The how to for the newcomer!   About a month ago I agreed to give a Skype presentation to a local ham club known as the Ventura County Amateur Radio Club (VCARC) on the subject of homebrewing. Hey I am really good at soldering my fingers together so I guess I […] [...]

App note: IR remote control transmitter

Fri, 30 Dec 2016 15:44:06 +0000

Pinned onto Dangerous PrototypesIR remote control transmitter application note (PDF!) from Microchip: This application note illustrates the use of the PIC10F206 to implement a two-button infrared remote controller. The PIC10F2XX family of microcontrollers is currently the smallest in the world, and their compact sizes and low cost make them preferable for small applications such as this one. Two […] [...]

Die photos and analysis of the revolutionary 8008 microprocessor, 45 years old

Fri, 30 Dec 2016 01:27:03 +0000

Pinned onto Dangerous PrototypesKen Shirriff has written an article detailing die photos of the vintage Intel 8008 that reveal the circuitry it used: Intel’s groundbreaking 8008 microprocessor was first produced 45 years ago.1 This chip, Intel’s first 8-bit microprocessor, is the ancestor of the x86 processor family that you may be using right now. I couldn’t find good […] [...]